ARM: dts: msm: config MDP ad off for samarium

SAMARIUM hardware contains one APICAL block.
Add the register offset address of MDP's assertive
display block in DT. This enables the assertive display
feature in the driver.

Change-Id: I91303d141a61373ca4b78b99790fe89edd9feed7
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>